thuc hien phep tinh
a A=1.2.3....9-1.2.3....8-1.2.3...8.8
thuc hien cac phep tinh sau 1.2.3.....9-1.2.3.....8-1.2.3.....7.\(8^2\)
A= 1.2.3...9- 1.2.3...8-1.2.3...8.8
=1.2.3...8(9-1-8)
=1.2.3...8.0=0
Chúc bạn học tốt
\(A=1.2.3...9-1.2.3...8-1.2.3...8.8\)
\(=1.2.3...8.\left(9-1-8\right)\)
\(=1.2.3...8.0\)
\(=0\)
A = 1.2.3....9 - 1.2.3...8 - 1.2.3.....8.8
Thuc hien cac phep tinh sau một cách hợp lí:
a) (10^2 + 11^2 + 12^2) : (13^2 + 14^2)
b) 1.2.3...9-1.2.3...8-1.2.3...7.8^2
c) (3.4.2^16)^2/11.2^13.4^11-16^9
d) 1152 - (374 + 1152) +(-65 + 374)
e) 13-12+11+10-9+8-7-6+5-4+3+2-1
1.2.3......9-1.2.3....8-1.2.3.....8.8 mng giúp với ạ
=1*2*3*...*8(9-1)-1*2*3*...*8*8
=0
giúp tui mới
a, A=1.2.3...9-1.2.3...8-1.2.3...8.8
giúp mới nha
\(1.2.3.....9-1.2.3.....8-1.2.3...8.8\)
Giair nhanh mình tick!
1.2.3....9-1.2.3....8-1.2.3...8.8= 1.2.3....9-(12.3....8+1.2.3...8.8)=1.2.3...9-(1.2.3....8(1+8)=1.2.3....9-1.2.3....9=0
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1.2.3...8.9 -1.2.3...8 -1.2.3...8.8
\(1.2.3...8.9-1.2.3...8-1.2.3...8.8\\ =1.2.3.4...7\left(9-1-8\right)\\ =0.1.2...7=0\)
Chúc bn học tốt
Tính
A = 1.2.3...8.9 - 1.2.3...7.8 - 1.2.3...8.8
\(A=1.2.3.4...8.9-1.2.3.4...7.8-1.2.3...8.8\)
\(A=1.2.3...8.\left(9-1-8\right)\)
\(A=1.2.3...8.9.0\)
\(A=0\)
Vậy \(A=0\)
~ Học tốt ~